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To keep a proper prescriptive standard of performance you should consider ashrae 62.2 & csa f326. As far as I understand most motors are UL tested without a load applied for a system with in a parabolic curve.

Runs exceeding the recommended lengths will only cause air to be ratified in a way that is objectionable to the desired volume. In other words, if you want a smooth delivery of design variables without under/over ventilating then matching the collar size isn't the best approach for your fart fan.

Last edited by Joseph'bidness; 02-07-2013 at 09:14 PM.
Reason: Grammar